package com.artisan.common.utils;

import java.security.MessageDigest;

/**
 * Created by xierongxian on 2016/4/21.
 * MD5加密解密
 */
public class MD5 {

    /**
     * 加密
     * xierongxian
     * */
    public static String MD5(String inStr) {
        MessageDigest md5 = null;
        try {
            md5 = MessageDigest.getInstance("MD5");
        } catch (Exception e) {
            System.out.println(e.toString());
            e.printStackTrace();
            return "";
        }
        char[] charArray = inStr.toCharArray();
        byte[] byteArray = new byte[charArray.length];

        for (int i = 0; i < charArray.length; i++)
            byteArray[i] = (byte) charArray[i];

        byte[] md5Bytes = md5.digest(byteArray);

        StringBuffer hexValue = new StringBuffer();

        for (int i = 0; i < md5Bytes.length; i++) {
            int val = ((int) md5Bytes[i]) & 0xff;
            if (val < 16)
                hexValue.append("0");
            hexValue.append(Integer.toHexString(val));
        }

        return hexValue.toString();
    }

    /**
     * xierongxian
     * 解密*/
    public static String JM(String inStr) {
        char[] a = inStr.toCharArray();
        for (int i = 0; i < a.length; i++) {
            a[i] = (char) (a[i] ^ 't');
        }
        String k = new String(a);
        return k;
    }
    // 可逆的加密算法
    public static String KL(String inStr) {
        // String s = new String(inStr);
        char[] a = inStr.toCharArray();
        for (int i = 0; i < a.length; i++) {
            a[i] = (char) (a[i] ^ 't');
        }
        String s = new String(a);
        return s;
    }

    public static void main(String a[]){
        String s = new String("xierongxian");
        System.out.println("原始：" + s);
        System.out.println("MD5后：" + MD5(s));
        //System.out.println("MD5后再加密：" + KL(MD5(s)));
        System.out.println("解密为MD5后的：" + JM(MD5(s)));
    }

    /*public static void main(String[] args) {

        String str = "宁晓嫚123";
        System.out.println("原内容：" + str);
        String result = encrypt(str);
        System.out.println("加密后：" + result);
        System.out.println("解密后：" + reencrypt(result));
    }*/

    //加密
    public static String encrypt(String str){
        StringBuffer buf = new StringBuffer();
        char[] cs = str.toCharArray();
        char a;
        for (int i = 0; i < cs.length; i++) {
            a = (char) ((int)cs[i] + 12345);
            buf.append(a);
        }
        return buf.toString();
    }

    //解密
    public static   String reencrypt(String str){
        StringBuffer buf = new StringBuffer();
        char[] cs = str.toCharArray();
        char a;
        for (int i = 0; i < cs.length; i++) {
            a = (char)((int)cs[i] - 12345);
            buf.append(a);
        }
        return buf.toString();
    }


}
